From £2,416
Create Bespoke is a team of design and build experts, specialising in bespoke and luxury finishes. Your vision is at the heart of our process. Thro...
From £2,704
Dulwich Kent, SE21
Business Email:info@ Glazing & Boarding With local glaziers available 24 hours a day, 7 days a week we...
From £2,184
No Call out charges!
All Jobs Fully Insured and Guaranteed !!!
All aspects of Plumbing, Heating and Drains....
...From £2,552
We are Parallax and specialise in Construction Project Management and Design and Build with year long experience in the London high end residential...
From £2,568
Need to find an Extension Builder near you for all your extension buildering work?
St Ives Decor provides a local, trusted extension builde...
From £2,488
Martin's Builders & Decorators is a trusted extension builder serving customers in Dulwich and the surrounding area. Contact us to today to get a c...
From £2,512
Urban London Development is an established extension buildering business in Dulwich. We come highly recommended and provide competitive quotes for ...
From £2,472
BERNARD CONSTRUCTION LTD are here to help customers who need an Extension Builder in Dulwich. We offer a competitive rate to complete all your exte...
From £2,528
Trusted and professional extension builder in Dulwich. Experienced in all extension buildering work and keeping within budget and on quote. JM Prop...
From £3,224
Buci builders ltd is a trusted extension builder serving customers in Dulwich and the surrounding area. Contact us to today to get a competitive qu...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Dulwich it ranges from £2,184 (RCB Group Design & Build based in SE21) to £3,224 (Buci builders ltd based in SE27).
Comparing extension builders estimates for fitting an RSJ gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
Get rates and quotes to install an RSJ in Dulwich by posting a job with HaMuch and we will send it to extension builders in Dulwich.
Whether you’re looking to extend your kitchen with a side return extension or you want to convert your basement into a liveable space, read our cost guides to get an idea of how much each project costs before getting a more accurate quote from our database of reliable tradespeople.

Underpin a building - £17,865

Two storey extension - £88,547

Build a timber frame extension - £26,365

Build a swimming pool - £81,365

Single storey extension - £62,296

Side return extension - £45,604

Install an RSJ - £2,565

Outbuilding - £10,365

Build a Mansard loft conversion - £52,365

Loft conversion - £37,170

Build a kitchen extension - £42,365

Hip to gable loft conversion - £42,365

Granny annexe - £87,365

Garden office - £10,365

Convert a Garage - £16,365

Garage - £18,865

Build a flat roof extension - £22,365

Build a dormer loft conversion - £42,365

Concrete foundations - £6,615

Convert a bungalow loft - £29,365

Convert a basement - £41,604